PULSE ARC WELDING TECHNOLOGY FOR THIN-SHEET CASING PRODUCTS MADE FROM AL-MG-CU ALUMINUM ALLOYS WITH RECIPROCATING FILLER WIRE FEED

Dabber TIG welding can be defined as a modification of an automatic TIG welding system. Modifications, both mechanical and electronic, combine to cause an intermittent filler wire feed to the molten weld puddle. This interrupted action allows for momentary cooling of the weld puddle. Energy input, as heat, for a given time span is reduced by this action. In addition the interruption allows solidification of the puddle with resultant narrow, uniform bead. This weld mode is characterized by shallow heat affected zones and precise weld build up configurations. This paper describes the application of this procedure to Gas Turbine Seals.

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Real-time monitoring and control of porosity defects during arc welding of aluminum alloys

Journal of Materials Processing Technology ◽

10.1016/j.jmatprotec.2020.116832 ◽

2020 ◽

Vol 286 ◽

pp. 116832

Author(s):

Yiming Huang ◽

Yuxue Yuan ◽

Lijun Yang ◽

Di Wu ◽

Shanben Chen

Keyword(s):

Aluminum Alloys ◽

Real Time ◽

Arc Welding ◽

Monitoring And Control ◽

Real Time Monitoring ◽

Porosity Defects ◽

And Control

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Stored Energy Welding Technology of Ultra-Thin Sheet Stainless Steel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.749.27 ◽

2013 ◽

Vol 749 ◽

pp. 27-30

Author(s):

Hao Bin Zhou ◽

Ju Lian Ma ◽

Xiang Qian Xu

Keyword(s):

Stainless Steel ◽

Spot Welding ◽

Joint Strength ◽

Thin Sheet ◽

Welding Parameter ◽

Welding Parameters ◽

Dynamic Resistance ◽

Stored Energy ◽

Welding Technology ◽

The Hard Problem

Considering the characteristics of the multilayered ultra-thin sheet stainless steel, by chosen the proper equipments and stored energy welding technology, the optimizing welding parameters are got from the condenser discharge spot welding experiments. The energy stored in the capacitor group is controlled by the energy required during welding and the discharge current is controlled by the size of dynamic resistance in resistance spot welding. So those control ways can better solve the hard problem of choosing welding parameter. The joint strength of ultra-thin sheet stainless steel is ensured by the reasonable quality assessment methods. The processed spot-welded joints are of good quality and appearance.

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Contributions Regarding the Use of Mechanical Vibrations in Order to Improve the Properties of Steels and Welded Joints Used in Metal Constructions

RECENT - REzultatele CErcetărilor Noastre Tehnice ◽

10.31926/recent.2020.61.067 ◽

2020 ◽

Vol 21 (2) ◽

pp. 67-71

Author(s):

Gheorghe Novac ◽

Bogdan Novac

Keyword(s):

Welded Joints ◽

Arc Welding ◽

Significant Contribution ◽

Welding Process ◽

Internal Stresses ◽

Welding Equipment ◽

Welding Technology ◽

Submerged Arc ◽

Very High

The paper presents aspects regarding the influence of vibrations on the mechanical properties of welded joints, made with basic materials of Spanish and Romanian origin. In this research is presented the practical way to make the necessary assemblies for the proposed tests. The tests show that vibrations have a significant contribution to the quality of welded joints. This is explained by the appearance of several crystallization centres which makes the structure finer. By using vibrations, the atoms are rearranged in the structure, ensuring a proper de-tensioning. The stresses induced in welded metals are significantly reduced by the use of vibration during welding process. The addition materials have a significant contribution to the emergence of stresses in welded joints as well. These stresses can contribute to the appearance of microstructural constituents with significant hardness. The welding equipment and technologies used also have a significant contribution to the emergence of the remaining stresses. For example, the submerged arc welding technology (SAF) can introduce very high internal stresses. By using vibrations during the welding process, it is achieved a fine structure and a significant reduction of remaining stresses in the welded joints.

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